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Ree Geochemistry of Lignites in the Lincang Germanium Deposit, Western Yunnan Province, China Petrologic and Mineralogical Study

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Ree Geochemistry of Lignites in the Lincang Germanium Deposit, Western Yunnan Province, China Petrologic and Mineralogical Study Goldschmidt Conference Abstracts 2002 A619 Ree geochemistry of Lignites in the Petrologic and mineralogical study of Lincang germanium deposit, Western enclaves in plutons in the typical Yunnan Province, China mining districts of Tongling , Anhui QI HUAWEN HU RUIZHONG SU WENCHAO Province and its bearing on the Institute of geochemistry , Chinese Academy of Sciences, process of magmatism - metallogeny Guiyang 550002, P. R. China([email protected]) X. QIN, Y. DU, W. ZHOU AND H. ZHANG Introduction Department of Earth Sciences, China University of The Lincang germanium deposit is located in Lin-cang Geosciences, Beijing 100083, P. R. China county, western Yunnan Province. There are three coal- ([email protected] ) 2 4 6 bearing cycles N1b N1b and N1b in the basin. Germanium 2 Two types of enclaves occur in magmatic plutons in mainly occurs in the lignite of the first coal cycle (N1b ), which is close to the basement granites. REE geochemistry of Tongling, Anhui Province. The first type is residuals of lignites and its relation with germanium mineralization was metamorphic rocks of high amphibole facies, and the other discussed. one is magmatic rocks with monzonic to dioritic compositions. A combined petrologic and mineralogical study has been carried out on the two types of enclaves in order to estimate Results and discuss their forming conditions and analyse their relations to hosts, Results indicate that Ge-rich lignites contain 3.862 which provides new insights into material source of magmatic × -6 ∆ × -6 °´2522.906 10 Ge REE varies from 5.070 10 to rocks and associated mineral deposits and gives a clue to × -6 148.225 10 while non-germanium lignites contain less than better understanding machanism – metallogeny. This leads to × -6 ∆ × -6 0.781 10 Ge and ° REE varies from 32.186 10 to propose a new metallogenic model for a stratabound skarn × -6 46.803 10 . Both the Ge-rich ligintes and non-Ge lignites type of ore deposits associated with a syntactic type of have distinct ne-gative Eu anomaly and weak positive Ce magmatic rocks. The new model can be simply summarized as anomaly. The American shale-normalized REE patterns of partial melting of old metamorphic basement rocks in depth Non-Ge lignite and Ge-poor lignite are plain¨similar to the and accumulating, differentiating and positioning of magmas basemental granites. But Ge-rich lignites’ NAS-norm-alized to form deep-level and shallow-level magma chambers, REE patterns are varia-ble, HREE concen-trated with the followed by mixing of different composition magmas increasement of Ge. Their NAS-normalized REE patterns are associated with their crypto-explosion, migrating of gas- similar to siliceous rocks¨which formed under hydro-thermal bearing ore fluids and precipitating of metals in the fluids environ-ment. within the magmas. Conclusion The germanium content of non-germanium lignite is very low indicate that under ordinary sedimentary environment the abnormal enrichment of germanium in lignite is not controlled by the continental source materials or the coal-forming plants. The distribution of Ge-rich lignite is consistent with siliceous rocks siliceous rocks contain 78.374×10-6 germanium in average their REE and trace element compositional feature are similar suggest most germanium in lignite was mainly brought by hydrothermal water. References Qi huawen Hu Ruizhong,¨Su Wenchao, et al 2002, Geochimica 31, 3-9.
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